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New Acrylate Co-Polymer Membrane Synthetized by Photo-Polymerization Technique for Lead (II) Ion-Selective Electrode
Summary
Researchers synthesized a novel p(THFA-co-HEMA) acrylate co-polymer membrane via photo-polymerization and developed it into a lead(II) ion-selective electrode (Pb-ISE). The sensor demonstrated a detection range from 0.1 to 10-6 M with a LOD of 7.59 x 10-7 M, a response time of 6.7 seconds, and validation results equivalent to AAS standard methods for real environmental water and sediment samples.
A novel p(THFA-co-HEMA) membrane based on acrylate CP was successfully synthesized through PP technique, and applied into Pb-ISE (Pb-ISE). THFA optimum composition was HEMA 9:1 (TH91), with a Tg of -6.5 o C. The structure of p(THFA-co-HEMA) was characterized using FTIR. The Pb-ISE sensor showed remarkable calibration measurement in the range from 0.1 to 10 -6 M, with a LOD of 7.59 x 10 -7 M, and it has obeyed a Nernstian number of 30.5 mV/dec. In addition, the fabricated Pb-ISE sensors showed fairly good selectivity coefficients of several types of ions, such as K + (-6.53 0.11), Na + (-6.35 0.16), NH4 + (-6.76 0.11), Mg 2+ (-12.15 0.13), Ca 2+ (12.12 0.14), Cu 2+ (-4.33 0.11) and Cd 2+ (-6.43 0.17), and an effective function in the pH range from 3 to 8. The resulting response time was quite good, 6.7 sec, with a change of 27.5 mV for a decade. The Pb-ISE sensor also showed validation results equivalent to AAS standard method, where the corresponding data with real samples produced values of 9.3 1.9 and 9.2 2.0 ppm and 275.5 10.3 and 277.7 4.0 g/g, for CREW and CRMS, respectively.
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